Add mirrors tests

test/codegen/lib/mirrors/inherited_metadata_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library test.mirrors;
+
+@MirrorsUsed(targets: "test.mirrors")
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+
+class RemoteClass {
+  final String name;
+  const RemoteClass([this.name]);
+}
+
+class A {
+}
+
+@RemoteClass("ASF")
+class B extends A {
+}
+
+class C extends B {
+}
+
+
+void main() {
+  bool foundB = false;
+
+  MirrorSystem mirrorSystem = currentMirrorSystem();
+  mirrorSystem.libraries.forEach((lk, l) {
+    l.declarations.forEach((dk, d) {
+      if(d is ClassMirror) {
+        d.metadata.forEach((md) {
+          InstanceMirror metadata = md as InstanceMirror;
+          // Metadata must not be inherited.
+          if(metadata.type == reflectClass(RemoteClass)) {
+            Expect.isFalse(foundB);
+            Expect.equals(#B, d.simpleName);
+            foundB = true;
+          }
+        });
+      }
+    });
+  });
+
+  Expect.isTrue(foundB);
+}
+